Here are the error logs, hope this can help:
Mono path[0] = 'C:/Program Files (x86)/Steam/steamapps/common/Timberborn/Timberborn_Data/Managed'
Mono config path = 'C:/Program Files (x86)/Steam/steamapps/common/Timberborn/MonoBleedingEdge/etc'
Initialize engine version: 6000.0.16f1 (ae37dbaefed8)
[Subsystems] Discovering subsystems at path C:/Program Files (x86)/Steam/steamapps/common/Timberborn/Timberborn_Data/UnitySubsystems
kGfxThreadingModeSplitJobs is not supported on Direct3D 11. Reverting to kGfxThreadingModeClientWorkerJobs instead.
GfxDevice: creating device client; kGfxThreadingModeClientWorkerJobs
Direct3D:
Version: Direct3D 11.0 [level 11.1]
Renderer: NVIDIA GeForce RTX 2060 SUPER (ID=0x1f06)
Vendor: NVIDIA
VRAM: 8019 MB
Driver: 31.0.15.3623
Begin MonoManager ReloadAssembly
- Loaded All Assemblies, in 1.354 seconds
- Finished resetting the current domain, in 0.006 seconds
[PhysX] Initialized MultithreadedTaskDispatcher with 12 workers.
ERROR: Shader Hidden/Universal Render Pipeline/DBufferClear shader is not supported on this GPU (none of subshaders/fallbacks are suitable)
<RI> Initializing input.

New input system (experimental) initialized
Using Windows.Gaming.Input
<RI> Initialized touch support.

UnloadTime: 0.395600 ms
Starting game version 0.6.8.4-e18214b-sw
System info:
System: Windows 10 (10.0.19045) 64bit
CPU: AMD Ryzen 5 3600 6-Core Processor
GPU: NVIDIA GeForce RTX 2060 SUPER
GPU memory: 8019MB
RAM: 32699MB
Drives:
C:\ 15.67GB free from 222.94GB
D:\ 1511.62GB free from 1863.00GB
Successfully connected to the Steam client.
RenderGraph is now enabled.
Successfully connected to the Steam client.
Modded: true, official
- Harmony (v2.3.3)
- KnatteMaterials (v1.0.2)
- Ladder (v2.1.2)
- Staircase (v2.1.9)
- TimberApi (v0.7.7.0)
- Flywheels (v2.0.3.2)
Spinning up Flywheels
Unloading 6 Unused Serialized files (Serialized files now loaded: 4)
UnloadTime: 7.035500 ms
Unloading 7 unused Assets to reduce memory usage. Loaded Objects now: 5624.
Total: 3.937200 ms (FindLiveObjects: 0.209200 ms CreateObjectMapping: 0.119300 ms MarkObjects: 3.563100 ms DeleteObjects: 0.045500 ms)

Successfully connected to the Steam client.
Previous resolution: 1920 x 1080
New resolution 1920 x 1080
Display resolution: 1920 x 1080
Full screen: True
Graphics quality: Medium
Resolution scale: 1
VSync: 1
Frame rate limit:
Unloading 6 Unused Serialized files (Serialized files now loaded: 4)
UnloadTime: 117.978100 ms
Loading saved game riverhell - 2024-04-06 20h05m, Day 1-1.autosave at 2024-10-13 19:54:21Z
Opening file: C:\Users\ashta\OneDrive\Documents\Timberborn\Saves\riverhell\2024-04-06 20h05m, Day 1-1.autosave.timber
Number of threads: 5
Previous resolution: 1920 x 1080
New resolution 1920 x 1080
Display resolution: 1920 x 1080
Full screen: True
Graphics quality: Medium
Resolution scale: 1
VSync: 1
Frame rate limit:
Shader 'Standard': fallback shader 'VertexLit' not found
Shader 'Standard': fallback shader 'VertexLit' not found
Timberborn.Persistence.EntityInstantiationException: Failed to instantiate '4Wdistrictcenter_0' ---> Timberborn.PrefabSystem.PrefabMappingException: No prefab found with name '4Wdistrictcenter_0'
at Timberborn.PrefabSystem.PrefabNameMapper.GetPrefab (System.String prefabName) [0x00027] in <2bc94c1b10b4462198289ca9dcf39ee2>:0
at Timberborn.WorldPersistence.WorldEntitiesLoader.InstantiateEntity (System.String prefabName, System.Guid id) [0x00000] in <914d38c23da4495581b6bb5903ebb2d1>:0
--- End of inner exception stack trace ---
at Timberborn.WorldPersistence.WorldEntitiesLoader.InstantiateEntity (System.String prefabName, System.Guid id) [0x00052] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.WorldPersistence.WorldEntitiesLoader.InstantiateEntity (Timberborn.WorldSerialization.EntitySave entitySave, System.Collections.Generic.ICollection`1[T] instantiatedEntitySaves) [0x0000f] in <914d38c23da4495581b6bb5903ebb2d1>:0
First uncaught exception at 2024-10-13 19:54:41Z
Stopping all root objects in active scene
Creating an exception game save
Failed to create an exception game save due to exception: System.NullReferenceException: Object reference not set to an instance of an object
at Timberborn.SerializationSystem.PrimitiveTypeSerialization.Serialize (System.Object value) [0x0030d] in <97d7ada90ec6440abe05d42cfed7c9f6>:0
at Timberborn.SerializationSystem.ObjectSave.Set[T] (System.String name, T value) [0x00000] in <97d7ada90ec6440abe05d42cfed7c9f6>:0
at Timberborn.Persistence.ObjectSaver.Set (Timberborn.Persistence.PropertyKey`1[T] key, System.String value) [0x0000d] in <abf0f77133154cf3bc3afc20aa8ee234>:0
at Timberborn.Characters.Character.Save (Timberborn.Persistence.IEntitySaver entitySaver) [0x00017] in <cfb34397678f442598df79106aeeaff8>:0
at Timberborn.WorldPersistence.WorldSaveFactory.SaveEntity (Timberborn.EntitySystem.EntityComponent entity, Timberborn.WorldSerialization.EntitySave output) [0x0004d] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.WorldPersistence.WorldSaveFactory.SaveEntities (Timberborn.WorldSerialization.WorldSave worldSave) [0x0003e] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.WorldPersistence.WorldSaveFactory.Create () [0x0000b] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.WorldPersistence.WorldSaveEntryWriter.WriteToSaveEntryStream (System.IO.Stream entryStream) [0x00000] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.SaveSystem.SaveWriter.WriteToSaveStream (System.IO.Stream saveStream, System.Boolean leaveOpen) [0x0004b] in <de1b317885ad46afa37c4470b4f10bdb>:0
at Timberborn.GameSaveRuntimeSystem.GameSaver.Save (System.IO.Stream stream) [0x00000] in <d1376599b38544bab49b64c2acde3e0e>:0
at Timberborn.GameScene.GameSceneExceptionStateSaver.CreateExceptionSave () [0x00006] in <87db97ab7cd64c0d8bf627858ebbec34>:0
ObsoleteValueException: Couldn't deconvert AssignedDistrict to Timberborn.GameDistricts.DistrictCenter
at Timberborn.Persistence.ObjectLoader.Get[T] (Timberborn.Persistence.PropertyKey`1[T] key) [0x0002d] in <abf0f77133154cf3bc3afc20aa8ee234>:0
at Timberborn.GameDistricts.Citizen.Load (Timberborn.Persistence.IEntityLoader entityLoader) [0x00026] in <07eb7dcfd8c84071a356a8f86861230e>:0
at Timberborn.WorldPersistence.WorldEntitiesLoader.LoadEntity (Timberborn.Persistence.InstantiatedEntitySave entitySave) [0x00039] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.WorldPersistence.WorldEntitiesLoader.LoadEntities (System.Collections.Generic.IEnumerable`1[T] entitySaves) [0x00010] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.WorldPersistence.WorldEntitiesLoader.LoadNonSingletons () [0x00019] in <914d38c23da4495581b6bb5903ebb2d1>:0
at Timberborn.SingletonSystem.SingletonLifecycleService.LoadNonSingletons () [0x00010] in <3baea4e4f0a34384b6270bd95e516e38>:0
at (wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition.Timberborn.SingletonSystem.SingletonLifecycleService.LoadAll_Patch1(Timberborn.SingletonSystem.SingletonLifecycleService)
at Timberborn.SingletonSystem.SingletonLifecycleAdapter.Start () [0x00000] in <3baea4e4f0a34384b6270bd95e516e38>:0

Unloading 8047 unused Assets to reduce memory usage. Loaded Objects now: 962184.
Total: 870.022900 ms (FindLiveObjects: 89.252000 ms CreateObjectMapping: 20.897700 ms MarkObjects: 750.215100 ms DeleteObjects: 9.657600 ms)

Unloading 5 Unused Serialized files (Serialized files now loaded: 4)
UnloadTime: 367.951300 ms
Creating an error report: C:\Users\ashta\OneDrive\Documents\Timberborn\Error reports\error-report-2024-10-13-19h54m57s.zip

The other one if it help:
v0.6.8.4-e18214b-sw
ObsoleteValueException: Couldn't deconvert AssignedDistrict to Timberborn.GameDistricts.DistrictCenter
Timberborn.Persistence.ObjectLoader.Get[T] (Timberborn.Persistence.PropertyKey`1[T] key) (at <abf0f77133154cf3bc3afc20aa8ee234>:0)
Timberborn.GameDistricts.Citizen.Load (Timberborn.Persistence.IEntityLoader entityLoader) (at <07eb7dcfd8c84071a356a8f86861230e>:0)
Timberborn.WorldPersistence.WorldEntitiesLoader.LoadEntity (Timberborn.Persistence.InstantiatedEntitySave entitySave) (at <914d38c23da4495581b6bb5903ebb2d1>:0)
Timberborn.WorldPersistence.WorldEntitiesLoader.LoadEntities (System.Collections.Generic.IEnumerable`1[T] entitySaves) (at <914d38c23da4495581b6bb5903ebb2d1>:0)
Timberborn.WorldPersistence.WorldEntitiesLoader.LoadNonSingletons () (at <914d38c23da4495581b6bb5903ebb2d1>:0)
Timberborn.SingletonSystem.SingletonLifecycleService.LoadNonSingletons () (at <3baea4e4f0a34384b6270bd95e516e38>:0)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition.Timberborn.SingletonSystem.SingletonLifecycleService.LoadAll_Patch1(Timberborn.SingletonSystem.SingletonLifecycleService)
Timberborn.SingletonSystem.SingletonLifecycleAdapter.Start () (at <3baea4e4f0a34384b6270bd95e516e38>:0)

*note this crash log is from a moded save but the bug also persists on non-moded save, the only reason why i took that save was because i couldn't get the crash logs from the non-moded saves*